linux-kernel - Re: [PATCH -next 2/8] soc: fsl: cpm1: Simplify with dev_err

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Message-ID: <87abe3f1-3cf2-4331-8dde-a422716dd94a@kernel.org>
Date: Tue, 27 Aug 2024 15:50:45 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jinjie Ruan <ruanjinjie@...wei.com>, andrew@...n.ch,
 sebastian.hesselbarth@...il.com, gregory.clement@...tlin.com,
 herve.codina@...tlin.com, qiang.zhao@....com, christophe.leroy@...roup.eu,
 thierry.reding@...il.com, jonathanh@...dia.com, nm@...com,
 ssantosh@...nel.org, petlozup@...dia.com, pshete@...dia.com,
 christophe.jaillet@...adoo.fr, ulf.hansson@...aro.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-tegra@...r.kernel.org, jic23@...nel.org
Subject: Re: [PATCH -next 2/8] soc: fsl: cpm1: Simplify with dev_err_probe()

On 27/08/2024 13:46, Jinjie Ruan wrote:
> Use the dev_err_probe() helper to simplify error handling during probe.
> This also handle scenario, when EDEFER is returned and useless error
> is printed.

? Sorry, this cannot happen. Please point to below code which can defer.

> 
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
> ---
>  drivers/soc/fsl/qe/tsa.c | 62 +++++++++++++++-------------------------
>  1 file changed, 23 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/soc/fsl/qe/tsa.c b/drivers/soc/fsl/qe/tsa.c
> index 7fa399b7a47c..fc37d23b746d 100644
> --- a/drivers/soc/fsl/qe/tsa.c
> +++ b/drivers/soc/fsl/qe/tsa.c
> @@ -453,10 +453,8 @@ static int tsa_of_parse_tdms(struct tsa *tsa, struct device_node *np)
>  
>  	for_each_available_child_of_node_scoped(np, tdm_np) {
>  		ret = of_property_read_u32(tdm_np, "reg", &tdm_id);
> -		if (ret) {
> -			dev_err(tsa->dev, "%pOF: failed to read reg\n", tdm_np);
> -			return ret;
> -		}
> +		if (ret)
> +			return dev_err_probe(tsa->dev, ret, "%pOF: failed to read reg\n", tdm_np);
>  		switch (tdm_id) {
>  		case 0:
>  			tsa->tdms |= BIT(TSA_TDMA);
> @@ -465,18 +463,15 @@ static int tsa_of_parse_tdms(struct tsa *tsa, struct device_node *np)
>  			tsa->tdms |= BIT(TSA_TDMB);
>  			break;
>  		default:
> -			dev_err(tsa->dev, "%pOF: Invalid tdm_id (%u)\n", tdm_np,
> -				tdm_id);
> -			return -EINVAL;
> +			return dev_err_probe(tsa->dev, -EINVAL, "%pOF: Invalid tdm_id (%u)\n",
> +					     tdm_np, tdm_id);
>  		}
>  	}
>  
>  	for_each_available_child_of_node_scoped(np, tdm_np) {
>  		ret = of_property_read_u32(tdm_np, "reg", &tdm_id);
> -		if (ret) {
> -			dev_err(tsa->dev, "%pOF: failed to read reg\n", tdm_np);
> -			return ret;
> -		}
> +		if (ret)
> +			return dev_err_probe(tsa->dev, ret, "%pOF: failed to read reg\n", tdm_np);
>  
>  		tdm = &tsa->tdm[tdm_id];
>  		tdm->simode_tdm = TSA_SIMODE_TDM_SDM_NORM;
> @@ -484,35 +479,26 @@ static int tsa_of_parse_tdms(struct tsa *tsa, struct device_node *np)
>  		val = 0;
>  		ret = of_property_read_u32(tdm_np, "fsl,rx-frame-sync-delay-bits",
>  					   &val);
> -		if (ret && ret != -EINVAL) {
> -			dev_err(tsa->dev,
> -				"%pOF: failed to read fsl,rx-frame-sync-delay-bits\n",
> -				tdm_np);
> -			return ret;
> -		}
> -		if (val > 3) {
> -			dev_err(tsa->dev,
> -				"%pOF: Invalid fsl,rx-frame-sync-delay-bits (%u)\n",
> -				tdm_np, val);
> -			return -EINVAL;
> -		}
> +		if (ret && ret != -EINVAL)
> +			return dev_err_probe(tsa->dev, ret,
> +					     "%pOF: failed to read fsl,rx-frame-sync-delay-bits\n",
> +					     tdm_np);
> +		if (val > 3)
> +			return dev_err_probe(tsa->dev, -EINVAL,
> +					     "%pOF: Invalid fsl,rx-frame-sync-delay-bits (%u)\n",
> +					     tdm_np, val);
>  		tdm->simode_tdm |= TSA_SIMODE_TDM_RFSD(val);
>  
>  		val = 0;
>  		ret = of_property_read_u32(tdm_np, "fsl,tx-frame-sync-delay-bits",
>  					   &val);
> -		if (ret && ret != -EINVAL) {
> -			dev_err(tsa->dev,
> -				"%pOF: failed to read fsl,tx-frame-sync-delay-bits\n",
> -				tdm_np);
> -			return ret;
> -		}
> -		if (val > 3) {
> -			dev_err(tsa->dev,
> -				"%pOF: Invalid fsl,tx-frame-sync-delay-bits (%u)\n",
> -				tdm_np, val);
> -			return -EINVAL;
> -		}
> +		if (ret && ret != -EINVAL)
> +			return dev_err_probe(tsa->dev, ret,
> +				"%pOF: failed to read fsl,tx-frame-sync-delay-bits\n", tdm_np);
> +		if (val > 3)
> +			return dev_err_probe(tsa->dev, -EINVAL,
> +					     "%pOF: Invalid fsl,tx-frame-sync-delay-bits (%u)\n",
> +					     tdm_np, val);
>  		tdm->simode_tdm |= TSA_SIMODE_TDM_TFSD(val);
>  
>  		if (of_property_read_bool(tdm_np, "fsl,common-rxtx-pins"))
> @@ -645,10 +631,8 @@ static int tsa_probe(struct platform_device *pdev)
>  		return PTR_ERR(tsa->si_regs);
>  
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "si_ram");
> -	if (!res) {
> -		dev_err(tsa->dev, "si_ram resource missing\n");
> -		return -EINVAL;
> -	}
> +	if (!res)
> +		return dev_err_probe(tsa->dev, -EINVAL, "si_ram resource missing\n");
>  	tsa->si_ram_sz = resource_size(res);
>  	tsa->si_ram = devm_ioremap_resource(&pdev->dev, res);
>  	if (IS_ERR(tsa->si_ram))

Best regards,
Krzysztof